Yes, reindeer eyes can change color depending on the time of year and the lighting conditions. In the summer months, when the days are longer and the sun is brighter, reindeer eyes are a golden brown color. In the winter months, when the days are shorter and the lighting is dimmer, reindeer eyes are a bright blue or green color. Reindeer eyes also have a unique reflective layer called the tapetum lucidum, which helps them see better in low light conditions and makes their eyes shine brightly in the dark.